Multiple boring-machine



(No Model.)

G; CRISTADORO. MULTIPLE BORING MACHINE.

No. 529,711 Paten' ed'Novrzv,1894.

I I Charles Crisi'adora,

oe]? W E I UNITED STATES PATENT OFFICE.

CHARLES ORISTADORO, OF ST. PAUL, MINNESOTA.

MULTIPLE BORING-MACHINE' SPECIFICATION forming part of Letters PatentNo. 529,712, dated November. 27, 1894. Application filed April 30, 1892.Serial No. 481,331. (No model.)

f0 aZZ whom it may concern.-

Be it known that I, CHARLES CRISTADORO, of St. Paul, Ramsey county,Minnesota, have invented a certain Improved Multiple Boring- Machine, ofwhich the following is a specifica- I ti'on.

My invention relates to improvements in boring machines; its objectbeing to provide a mechanism by which any desired number sheaves,carryinga belt connected to a source of power, whereby all the bits areoperated simultaneously, and at equal speed.

My invention further consists in the specific construction andcombination hereinafter described and particularly pointed out in theclaims.

In the accompanying drawings forming part of this specification, Figurel is a plan View, and Fig. 2 is a side elevation of my improved machine.

In the drawings 2 represents the rectangular bed supported upon theframe A and provided with guides or slots 3, parallel with the sides ofthe bed. In these guides are adj ustably secured the. clamp blocks 4, inany desired manner, as by means of set screws 5 engaging the undersideof the bed. These clamps have cylindrical openings to receive arms 6,the blocks being split as shown in Fig. 2, and adapted to be closedtogether by' means of the screws 7, thereby clamping the members tightlyupon the arms. These arms extend at right angles to the guides in whichthe respective blocks are secured, one end being fitted with a yoke 8 inwhich is journaled the vertical spindle 9 fitted with the sheave 10, andprovided with the bit chuck 34, adapted to receivethe auger or hit 11,in the ordinary manner.

12 is a driving shaft connected to a suitable source of power,and'fittedwith the driving pulley 13. The belt let runs fromthe drivingpulley around the several sheaves l0, and the sliding sheave 15. Thissheave is mounted upon a block 16 which works in a guide upon the arm17, under the tension of the cord 18,-

running from the block over the sheave 33, and supporting the weight 19,by means of which uniform tension of the belt 14-is secured. Underneaththe series of bits is arranged a table B, provided with the transverseguide 20 and longitudinal guide 21, along which are adj ustably securedthe stops 22 and 23. These stops are arranged at right angles with eachother as shown, and so adjusted astohold a box or pieceof stock 24;

laid upon the table and bearing against the stops in position to bebored. The table B is supported by the cross bars 25 and 26, fitted tothe vertical guides 27. The cross bars are adjustably connected togetherby means of the hand screw 28, having a bearing in one and threadedthrough the other, whereby the height to which the table can be liftedmay be varied at will. To the crossbar 26 are connected the levers 29,which have their pivot fulcrum on the cross bar 30, their power endsbeing connected to the treadle 3i. By depressing the treadle the tableis liftedcarrying the stock laid upon it against the bits 11, the depthof the holes bored being determined by the adjustment above described.In order to force the stock off the bits after being bored, I provide asmall frame or plate 35, supported centrally over the table by means ofthe spring arms 36 secured to the in Fig. 1, and the requisite number ofbits ad.

vanced and secured in position over its edges.

Power is then applied to drive the belt, and

the treadle is depressed carrying the table upward against the tensionof the springs 36,

and with it the box laid thereon, the bits boring holes of requireddepth therein. Upon releasing the treadle, the table drops, carryingwith it the box, the springs 36 assisting in clearing the box from thebits, which can then be removed and another'substituted therefor, theoperation being repeated, and the parts can in a few minutes bereadjusted to adapt them to any other size of box.

I claim- 1. The combination of the bits, eachindependently, laterallyadjustable in all directions, the stock holder adjustable to differentsizes of stock, and means for moving one of said parts a predetermineddistance toward the other.

2. The combination with the bits each independently, laterallyadjustable in all directions, of the table movable to and from the same,substantially as described.

3. The combination of bits each independently, laterally adjustable inall directions, the support adjustably movable to and from said bits,and the laterally adjustable stops upon saidsupport, substantially asdescribed.

4. The combination of bits, each independ ently, laterally adjustable inall directions, means for operating them simultaneously, and meansadjustable to different sizes of stock, for carrying the stock againstsaid bits, substantially as described.

5. The combination of bits, each independently, laterally adjustable,means for simultaneously operating the same, adjustable stock holdingdevices, and means for driving said bits into said stock to a limiteddepth, substantially as described.

6. The combination of parallel bits, each independently, laterallyadjustable in all directions, common means for simultaneously operatingthe same, the stock support adjustable to various sizes of stock, meansfor adjusting the normal distance between said support and said bits,and means for moving one toward and from the other, substantially asdescribed.

7. The combination of the stock support, devices carried thereby forholding diiferent sizes of stock, the gang of bits independently,universally adjustable in a horizontal plane, means for driving themsimultaneously, means for bringing the stock and bits. together, andmeans for limiting the depth of cut of the bits, substantially asdescribed.

8. In a device of the class described, the combination with therectangular frame, of the horizontal, vertically movable table arrangedtherein, the laterally adjustable stops upon the surface of said table,the bit chucks mounted in bearings above said table, means for laterallyadjusting the position of each of the same independently in anydirection,and means for simultaneously rotating the same, substantiallyasdescribed.

9. The combination with asuitable support, of the horizontal, verticallymovable table, the series of vertical bits supported above said table,means for laterally adjusting the position of each of said bits in anydirection, and means for simultaneously rotating the same, substantiallyas described.

10. In a device of the class described, the combination with thehorizontal, rectangular frame, of the guides parallel with therespective sides thereof, the horizontal vertically movable tablearranged within said frame, the laterally adjustable stops upon saidtable,the clamping blocksindependently adjustable along said guides, thebit carrying arm adjustable in each of said blocks, the bit chuckscarried by said arms and means for simultaneously rotating said chucks,substantially as described.

11. The combination with the frame, havinga horizontal, rectangular bed,of the guides parallel with the sides of said bed, the table arrangedcentrally in said bed and movable upon vertical guides, the treadlelevers for operating said table, the laterally adjustable stops uponsaid table, the series of independently laterally adjustable, verticalbits above said table, and means for simultaneouslyoperating thesame,substantially as described.

12. In a device of the class described, the combination with therectangular, horizontal frame, the guides upon the sides of said frameand parallel therewith, the horizontal table vertically movable withinsaid frame, the clamps independently adjustable along said guides, thearm adjustably secured in each of said clamps at right angles with saidguides, the bit chucks mounted in bearings upon the inner ends of saidarms, the sheaves upon the spindles of said chucks, the belt runningupon said sheaves and provided with a belt tightener, and a drivingpulley therefor connected to a suitable source of power, substantiallyas described.

In testimony whereof I have hereunto set my hand this 22d day of April,1892.

CHARLES CRISTADORO.

In presence of- 'I. D. MERWIN, H. S. JOHNSON IOC

